Dental engine



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L.S.PF0UTS. DENTAL ENGINE.

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UNITED STATES PATENT OFFICE.

LEROY S. PFOUTS, OF CANTON, OHIO.

DENTAL ENGINE.

SPECIFICATION forming part of Letters Patent No'. 510,484, datedDecember 12, 1893. Application filed January 13, 1893. Serial No.458,263. (No model.)

To all whom, t may concern.-

Be it known that I, LEROY S. PFOUTS, a citizen of the United States, anda resident of Canton, county of Stark, State of Ohio, have invented anew and useful Improvement in Dental Engines, of which the following isa full, clear, and exact description, reference being had to theaccompanying drawings, making part of this speciiication.

My invention relates to an improvement in dental engines, andparticularly to the class of dental engines, that are actuated byelectric motors.

The object of the invention is to provide means within the hand piece ortool holder or connected thereto, whereby the operator may control themovements of the motor.

lVith this end in view my invention consists of certain features ofconstruction and combination of parts as will be hereinafter describedor pointed out in the claims.

Figure l of the accompanying drawings is a plan view of a fragment of ahand piece with inclosed switch attached thereto, natural size. Fig.2,is a similar view enlarged showing a longitudinal section of assembledparts. Fig. 3, is a group of the several parts of the switch showingtheinin cross section and plan view. Fig. et, is a plan view withinclosng case cut away to disclose the parts in operative position.

Similar letters and numerals of reference indicate corresponding partsin all of the ii gures of the drawings.

Fig. l, of the drawings illustrates the adaptation of the invention,natural size.

Referring to Fig. 2, which is enlarged to show the parts moredistinctly, A represents a fragment of atool holder orhand piece withswitch attached or coupled thereto, and B, a tube made of hard rubber orsome non-mag netic material on which the several parts are assembled. Ois the covering or inclosing cap formed of the two open endedcylindrical portions D and E, one end of each part adapted to the tubeB, the other or open ends to slide together, one embracing the other asshown.

On the tube l5 is provided a series of rings and tubes of hard rubber orsome non-magnetic material, excepting the rings,Nos. l2 and 14, whichare of copper or electricity, and are placed upon some conductor ot thetube in the following order, beginning with No. 2, which serves as astop for ring No. 3, which is under cut to form a binder as hereinafterdescribed. Tube No. at, is preferably made of hard rubber having beveledends as shown, placed on the tube against ring No. 5; on this tube are'secured metal terminals or commutator segments No. 5 and 5'; about thetube No. 4, is placed an open sided tube No. 6, the edge portions tohave contact with the outer edges of the commutator strips No. 5 and 5',the space between the p arts 5 and 5 to be filled preferably with micato correspond with the surface of the metal commutator strips, and thehard rubber open-sided tube No. 6, the ends of the commutator strips andthe ends of the tubes mentioned to be beveled outwardly as shown againstwhich is now placed a binder ring, No. 7, beveled under as No. 3, tocorrespond with the bevel ends of the metal strips Nos. 5 and 5 and thetubes 4 and G. The rings Nos. 3 and 7should be made of some goodinsulating material, as they serve not only to bind and hold the partsNos. l, 6, and 5 5', that form the commutating portion of the switch,but to insulate the commutator thus formed; ring No. S, as ring No. 2,is made of some non-magnetic material and forms a spacing portionbetween the commutator and the hard rubber ring No. 9, in the peripheryof which are provided recesses a, b and c, in which the several branchesof the commutating brush are secured as shown in Fig. e; against thering No. 9, is placed a spacing ring No. lO, of material similar to Nos.2 and S, against which is placed the binding ring No. ll, and should beof asimi` lar insulating material; against this last mentioned ring isplaced a hard rubber tube 1S, having beveled ends, and a central annularrib d. About said tube and against the two sides of the rib d are placedcopper or other electric conducting metal, comm utating rings, Nos. l2and 1i, the outsides of which are beveled to correspond with the beveledends of the tube 13, and rings Nos. ll and l5, the outside diameter ofthe rings Nos. l2 and la to be a little larger than the diameter of therib d or of the rings adjacent thereto. The binding ring No. 15, is nowplaced against the beveled ends or sides 0f the ring No. la and tube i3,and against the ring No. l5 is IOO placed the insulating ring N o. 16,similar to ring N o. 2, by the two outside or end rings; the severalparts are heldin position as shown in Figs. 2 and 4, the circular endportion of the U-shaped brush Nos. 17 and 17', resting on thecommutating ring N o. 14, and the end of brush No. 18, resting on thecommutating ring No. 12, thus connecting the metal commutating strip orterminals 5 and 5 with the commutating rings No. 12 and 14.

On the inside of tube B are provided longitudinal by side as shown incross section B, Fig. 3, or if preferred, the grooves may be placedelsewhere in the tube, as they only serve to provide room within thetube and outside of the casing F, that incloses the flexible drivingcable G.

The leading in wire No. 25 by which the electric energy is conductedfrom the generator or place of supply, may be concealed under the coverF. The tube B, may be discontinued after passing out of the portion ofthe inclosing cap C; said wire is connected with the commutator ring 12,and communicates through the brush piece 18 to the commutator strip N o.5, and from there over wire N o. 22, to thearmature of the motor,(notshowm) and through said armature back on wire N o. 23, to thecommutating segment or strip N o. 5', to the brush strip No. 17', thenceto the commutating ring No. 14, and out to the dynamo or place ofsupply.

The middle ring No. 9, that supports the brushes and by which they arerotated about the rings Nos. 12 and 14, and over the commutator segmentsNos. 5 and 5', is connected to the E portion of the cover C to move orrotate with said cover about the tube B, to move the brushes over thesegments Nos. 5 and 5', to start or stop or reverse the movement of themotor and thereby start or stop or reverse the movement of the dentaltool in use in the tool holder or hand piece.

It will be seen by the foregoing description that by the use ofmyinvention, the rnogrooves e, which may be placed side' tor whereby theflexible shaft or driving cable is rotated, to rotate the dental tool,may be located remotely or near by, the control of which is placed withthe hand piece within the hand of the operator.

Having thus fully described the nature and object of my invention, whatI claim, and desire to secure by Letters Patent, is-

1. The combination with a dental hand piece of an electric currentswitch comprising the tubular portion B, tubes Nos. 4 and 6, andcommutator or terminal strips the sides and end portions of which arebeveled as shown, the non-magnetic binding rings Nos. 3 and 7, wherebythe before mentioned parts are held in operative position, the tube 13,having an annular rib d, the metal commutator rings Nos. 12 and 14having beveled sides as shown, the non-magnetic binding rings 11 and 15,and the non magnetic ring 9 to rotate about the tube B, to carry theswitch brush aboutthe commutator segments, and rings, substantially asdescribed andfor the purpose set forth.

2. The combination with the hand piece of a dental engine, inclosingI atool holder, rotated by an electric current, of a current controllingswitch and inclosing cap D, E, substantially as described and for thepurpose set forth.

3. The combination with the hand piece I and tool holder of a dentalengine of the tube B, having internal longitudinal grooves e, of theconducting wires, the commutator segments Nos. 5 and 5', the rings Nos.12 and 14, the ring N o. 9 to rotate about said tube to carry thebrushes 17, 17' and 18 about the commutator and an inclosing case,substantially as described and for the purpose set forth.

In testimony whereof I have hereunto set my hand this 4th day ofJanuary, A. D. 189.3

LEROY S. PFOUTS. Witnesses:

W. K. MILLER, OHAs. R. MILLER.

